Bobbin



y 13, 1954 c. K. DUNLAP 2,678,781

BOBBIN Original Filed Dec. 17, 1945 INVENTOR CHARLES K. DUNLAP BY W I. m,

ATTORNEY Patented May 18, 1954 BOBBIN Charles K. Dunlap, Hartsville, S. (3.,- assignor to Sonoco Products Company,

South Carolina Original application Dece 635,448, now Patent No.

1950. Divided an 1950, Serial No. 141,810

ary 17, uary 16,

2 Claims.

This invention relates to textile bobbins such as are used for supporting yarn or thread packages, and more particularly to fiangeless bobbins for use as supporting cores or carriers for synthetic fibers such as rayon and nylon. This is a division of my copending application Serial No. 635,448, filed December 1'7, 1945, on which U. S. Patent No. 2,495,058 issued on January 17, 1956.

With the progressive and wide increase in uses 01"- synthetic fibers the requirements for satis factory bobbins for winding of these fibers has become more and more strict. Rayon yarns, i'or example, vary all the way from bar twisted slick. finish yarn to very soft yarns i practically no twist and require bobbins uite different and varied from those used in prior years. Also, the winding of nylon has given rise to the problem of providing greater strength in the bobbin so as to resist the tremendous contracting forces exerted by nylon when it is wound on a bobbin and subjected to varying moisture conditions.

To meet these varied and increasingly strict requirements on bobbins and at the same time keep down the cost to a resasonably low level has presented a major commercial problem. I have now met this problem from both a technical and economic standpoint by providing new bobbin constructions.

According to the present invention I have conceived and developed a very simple, inexpensive type of reinforced. fiangeless bobbin that is particularly well suited for use with synthetic fibers.

Non-limiting embodiments of my invention are illustrated in the accompanying drawing in which:

Fig. 1 is an elevation of a modified form of the bobbin of the present invention;

Figs. 2 and 3 are corresponding top and bottom views respectively, of the bobbin shown in Fig. 1;

Fig. 4 is an elevation of a further modification or a bobbin constructed in accordance with the present invention, including an illustration of the disposition of an associated spindle;

Fig. 5 is a similar elevation of the bobbin shown in Fig. l and. rotated 90; and

Fig. 6 is an elevation of a bobbin, similar to those shown in Figs. 4 and 5, incorporating a modified means of eiiecting keyed engagement between the bobbin barrel and reinforcing sleeve.

The embodiment of the present invention illustrated in Figs. 1, 2 and 3 is a modification of the embodiment described in my above identia corporation of mber 1'7, 1945, Serial No.

2,495,058, dated Janu 11 this application Janfied copending application in that it is adapted to incorporate a difierent form of reinforcing sleeve and spindle bushing. In this case 2. bobbin barrel 2'1, which is in all respects similar to the bobbin barrel described in my copending application, is used in association with a reinforcing sleeve which is formed in two sections as shown at 28 and 29.

The lower section 28 of this r inforcing sleeve is formed at its lower end, as in my copending application, with extending ears 30 disposed in relation to the driving notches SI of bobbin barre l 21 and adapted to key the reinforcingsleeve to the bobbin barrel. This lower portion 23 also extends upwardly to a proper position foran upper spindle bushing and at this point is formed with an inwardly extending flange 32. The upper portion 28 of the reinforcing sleeve is formed with a similar flange 33 disposed at the point oi meeting with lower section 23 in relation to flange 32 as shown.

These two flanges 32 and 33 are engaged by a grommet 36 which is fixed in place over the flanges and secures th m together. The grommet E i is further disposed with an internal diameter corresponding to the spindle diameter so that it forms an upper spindle bushing. The grommet 3% may be readily positioned when it is fixed in place so that it will be centered properly as a spindle bushing. The upper portion 29 of the reinforcing sleeve extends upwardly to the top of bobbin barrel 2'! and is crimped over at this point as shown at 35.

In a bobbin constructed in this manner the reinforcing sleeve is fixed securely in the bobbin barrel 2? and, as in the previous embodiment described above, is keyed to the bobbin barrel by the arrangement of the driving notches. Moreover, the assembled bobbin is adapted for replacement of worn or damaged parts through use of the grommet it, for one of the crimped flanges of this grommet can be easily cut off to free the sections 28 and 29 of thereinforcing sleeve and allow these sections to be withdrawn from the bobbin barrel 21. If, for example, the bobbin barrel 2'! should become scarred and wornthrough use so that it no longer presented a satisfactory winding surface, the bobbin might be readily dismantled as just described to remove the Worn bobbin barrel and reassembled with a new barrel by fixing another grommet 34 in place.

A further modification of the present invention is illustrated in Figs. 4 and 5 ofthe drawing. In Fig. 4, a spindle H, for driving lugs 24 arwill be Figs. 4 and 5 accordingly comprises only an outer fibrous tubular member 37 serving as a bobbin barrel, and an inner reinforcing sleeve 38. As before, however, the reinforcing sleeve 38 is disposed in keyed engagement with the bobbin barrel 31 by means of ears 39 formed to extend outwardly through the driving notches 40.

A further feature of thebobbins shown in Figs.

4 and 5 is a bottom flange formation liextending as shown outwardly over the bottom end of the bobbin barrel 37. This feature has the advantage of providing full protection for the lower end of bobbin barrel 3? so as to obviate damage at this point through rough handling, and it apparent that such an arrangement might also be included in the other embodiments disclosed in the present application.

The reinforcing sleeve 38 extends upwardly for substantially the full extent of the bobbin barrel 37, and the bobbin barrel is turned in over the upper end of reinforcing sleeve 38 as indi cated at 42 in Figs. 4 and 5. This turned in portion 42 may be readily arranged, if desired, with a shoulder formation as shown at 43, to provide "a seat for insertion of an identifying disk (not shown) to serve as a label for thread or yarn wound on the bobbin.

The reinforcing sleeve 33, as in the other embodiments described above, forms a sturdy support for the fibrous tubular member 37 forming the bobbin barrel and is adapted for easy replacement of the bobbin barrel 37 in the event that the barrel becomes worn or damaged. When it is desired to replace bobbin barrel 31, the barrel is simply stripped or cut oil of the reinforcing sleeve 38 and a new bobbin barrel 3? arranged in place. The reinforcing sleeve 33, as previously mentioned, is formed for a snug but sliding fit with the bobbin barrel 3? so that the replacement can be eifected readily and conveniently, and in assembled form the cars 39 extending through driving notches l3 lock the reinforcing sleeve 38 and bobbin barrel 3'? in keyed engagement.

In Fig. 6 of the drawing, a modified means is shown for effecting keyed engagement between the bobbin barrel 3? and reinforcing sleeve 38. In this case the reinforcing sleeve 33 is formed with generally triangular shaped ears 34 which are struck outwardly in reinforcing sleeve 33 so that the points of the ears id extend downwardly as shown. With this arrangement the ears 4 will allow the bobbin barrel 3? to be arranged in place on the reinforcing sleeve 33 as described just above but will grip and prevent sliding removal of the bobbin barrel 3'5 through engagement of the downwardly extending points of ears 44 with the inner surface of the bobbin barrel.

Also, this engagement of the points of the cars :14

i with the bobbin barrel will key the bobbin barextending rel 37 to the reinforcing sleeve 38, and thus provides an effective means for obtaining keyed engagement between these elements in instances where it is not intended to use driving notches. The illustration in Fig. 6 of the drawing shows an arrangement of this sort in a bobbin in which no driving notches are included.

The bobbins of the present invention, as illustrated by the embodiments described above, provide a sturdy and serviceable construction which is well adapted for use with synthetic fibers and at the same time is simple and inexpensive. The manner of providing spindle bushings for the bobbins is of particular advantage in that the bushings are associated with the reinforcing sleeves so as to secure the elements of the bobbin demountably in assembled form. This feature is provided with a minimum of constituent elements for the bobbin, and yet the spindle bushing is incorporated so that it is readily centered in the bobbin upon assembly. Also, the adaption of the bobbin barrels and reinforcing sleeves for keyed engagement in assembled form integrates the bobbin construction for serviceable use without requiring auxiliary locking fixtures.

I claim:

1. A textile bobbin comprising a fibrous tubular member, a reinforcing sleeve disposed interiorly of and in keyed engagement with said fibrous tubular member, said reinforcing sleeve being formed in upper and lower sections which meet in said fibrous tubular member in relation to the proper position for an upper spindle bushing, each of said sections being formed with inwardly flanges at the point of meeting, and a grommet fixed in place over said flanges to form an upper spindle bushing and secure the elements of said bobbin in assembled form.

2. A textile bobbin comprising a fibrous tubular member, a reinforcing sleeve disposed interiorly of said fibrous tubular member, said reinforcing sleeve being formed in upper and lower sections which meet in said fibrous tubular member in relation to the proper position for an upper spindle bushing, each of said sections being formed with inwardly extending flanges at the point of meeting and with portions extending outwardly adjacent the ends of said fibrous tubular member in endwise containing relation therewith, and means assembled on said inwardly extending flanges for forming an upper spindle bushing and :ecuring the elements of said bobbin in assembled orm.

References Cited in the file of this patent UNITED STATES PATENTS Great Britain Aug. 1, 1929 

